78801717818 has 8 divisors (see below), whose sum is σ = 120717525312. Its totient is φ = 38562542716.

The previous prime is 78801717791. The next prime is 78801717829. The reversal of 78801717818 is 81871710887.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×78801717818² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 419157980 + ... + 419158167.

It is an arithmetic number, because the mean of its divisors is an integer number (15089690664).

Almost surely, 2^78801717818 is an apocalyptic number.

78801717818 is a deficient number, since it is larger than the sum of its proper divisors (41915807494).

78801717818 is a wasteful number, since it uses less digits than its factorization.

78801717818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 838316196.

The product of its (nonzero) digits is 1404928, while the sum is 56.

The spelling of 78801717818 in words is "seventy-eight billion, eight hundred one million, seven hundred seventeen thousand, eight hundred eighteen".